chore: custom accessibility action for user mention (WPB-15172)

[sbakhtiarov]

https://wearezeta.atlassian.net/browse/WPB-15172

https://wearezeta.atlassian.net/browse/WPB-15172

What's new in this PR?

Custom accessibility actions for user mentions.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 49.31%. Comparing base (1e55dfd) to head (8d791a7).

Files with missing lines	Patch %	Lines
...otlin/com/wire/android/ui/markdown/MarkdownText.kt	0.00%	1 Missing ⚠️

❌ Your patch check has failed because the patch coverage (0.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5011      +/-   ##
===========================================
- Coverage    49.31%   49.31%   -0.01%     
===========================================
  Files          650      650              
  Lines        23457    23458       +1     
  Branches      3606     3606              
===========================================
  Hits         11568    11568              
- Misses       10813    10814       +1     
  Partials      1076     1076              

Files with missing lines	Coverage Δ
...otlin/com/wire/android/ui/markdown/MarkdownText.kt	0.00% <0.00%> (ø)

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